21042010224 has 50 divisors (see below), whose sum is σ = 60901686120. Its totient is φ = 7014002976.

The previous prime is 21042010169. The next prime is 21042010229. The reversal of 21042010224 is 42201024012.

21042010224 is a `hidden beast` number, since 2 + 10 + 420 + 10 + 224 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21042010197 and 21042010206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042010229) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8116764 + ... + 8119355.

Almost surely, 2^21042010224 is an apocalyptic number.

21042010224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21042010224 is an abundant number, since it is smaller than the sum of its proper divisors (39859675896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21042010224 is a wasteful number, since it uses less digits than its factorization.

21042010224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16236139 (or 16236124 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21042010224 its reverse (42201024012), we get a palindrome (63243034236).

The spelling of 21042010224 in words is "twenty-one billion, forty-two million, ten thousand, two hundred twenty-four".